<!DOCTYPE html>
<html>

<head>
    <title>加载中……</title>
    <meta charset="utf-8">
    <script src="jquery-3.6.0.min.js" type="text/javascript"></script>
    <script>
        setTimeout(() => {
            $("p").html("如果长时间未跳转成功，请检查网络是否正常");
        }, 5000)
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<body>
    <h1 style="text-align: center;">加载中……</h1>
    <p style="text-align: center;"></p>
</body>

</html>